EP 2709102 A1 20140319 - Method and apparatus for determining an optimum frequency range within a full frequency range of a watermarked input signal
Title (en)
Method and apparatus for determining an optimum frequency range within a full frequency range of a watermarked input signal
Title (de)
Verfahren und Vorrichtung zur Bestimmung eines optimalen Frequenzbereichs innerhalb eines vollen Frequenzbereichs eines mit einem Wasserzeichen versehenen Eingangssignals
Title (fr)
Procédé et appareil permettant de déterminer une plage de fréquence optimale dans une gamme de fréquences complète d'un signal d'entrée filigrané
Publication
Application
Priority
EP 12306098 A 20120912
Abstract (en)
Many watermarking detection algorithms are correlation based, whereby an input signal is correlated with reference signals. The correlation with the best match determines the bit value of the watermark information. Usually a water-marked signal undergoes distortion before being fed to a watermark detector. However, the modification is stronger in some frequency ranges than in others. According to the invention, the correlation result for a current input signal section is in addition used for estimating the optimal frequency range or ranges for the following section's correlation, using a cumulative correlation value curve.
IPC 8 full level
G10L 19/018 (2013.01)
CPC (source: EP US)
G10L 19/018 (2013.01 - EP US); G10L 19/265 (2013.01 - US)
Citation (search report)
- [A] US 2003088327 A1 20030508 - TAORI RAKESH [NL], et al
- [A] EP 2387033 A1 20111116 - THOMSON LICENSING [FR]
- [A] KALANTARI N K ET AL: "A Robust Audio Watermarking Scheme Using Mean Quantization in the Wavelet Transform Domain", SIGNAL PROCESSING AND INFORMATION TECHNOLOGY, 2007 IEEE INTERNATIONAL SYMPOSIUM ON, IEEE, PISCATAWAY, NJ, USA, 15 December 2007 (2007-12-15), pages 198 - 201, XP031234256, ISBN: 978-1-4244-1834-3
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2709102 A1 20140319; EP 2896041 A1 20150722; TW 201419267 A 20140516; US 2015248892 A1 20150903; WO 2014040864 A1 20140320
DOCDB simple family (application)
EP 12306098 A 20120912; EP 13758814 A 20130829; EP 2013067925 W 20130829; TW 102132092 A 20130906; US 201314427655 A 20130829